01-15-2009 06:51 AM - edited 03-06-2019 03:27 AM
Hi Guys,
I have a new 2x 3560, do you have any suggestion on how can I make this redundant? Like you will just see 1 node for this two switches. I have configured an etherchannel on it but it seems it is not working.
interface GigabitEthernet0/1
channel-group 1 mode auto
switchport mode trunk
!
interface GigabitEthernet0/2
channel-group 1 mode auto
switchport mode trunk
Any help is very much appreciated. Thanks in advance.
Cheers!
Solved! Go to Solution.
01-15-2009 06:58 AM
Hi,
what do you get when you do:
sh ether sum
what do you see in the log?
At the very basic, i will have:
po1
switchport trunk encapsulation dot1q
switchport mode trunk
g0/1
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode desirable
g0/2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode desirable
01-15-2009 07:14 AM
Irvine
Can you post full configs for both switches.
if you want to connect the 2 switches togther with an etherchannel trunk
SW1(config)# int range gi0/1 - 2
SWI(config-if)# switchport
SWI(config-if)# switchport trunk encapsulation dot1q
SWI(config-if)# switchport mode trunk
SW1(config-if)# channel-group 1 mode on
do same config as above for SW2
Connect the 2 switches together on gi0/1 & 2.
3560 will run HSRP/GLBP. This is used for gateway redundancy. So an example
SW1
int vlan 10
ip address 192.168.5.2 255.255.255.0
standby 10 ip 192.168.5.1
standby 10 pri 110
standby 10 preempt
standby 10 auth
SW2
ip address 192.168.5.3 255.255.255.0
standby 10 ip 192.168.5.1
standby 10 pri 100
standby 10 auth
then any client in vlan 10 is given the default-gateway of 192.168.5.1
Jon
01-15-2009 06:56 AM
Irvine
What do you mean by redundant. Do you mean connect them togther with etherchannel and perhaps run HSRP between the 2 switches ?
Can you post output of
"sh etherchannel summary" &
"sh int trunk"
from both switches.
Jon
01-15-2009 07:05 AM
01-15-2009 07:14 AM
Irvine
Can you post full configs for both switches.
if you want to connect the 2 switches togther with an etherchannel trunk
SW1(config)# int range gi0/1 - 2
SWI(config-if)# switchport
SWI(config-if)# switchport trunk encapsulation dot1q
SWI(config-if)# switchport mode trunk
SW1(config-if)# channel-group 1 mode on
do same config as above for SW2
Connect the 2 switches together on gi0/1 & 2.
3560 will run HSRP/GLBP. This is used for gateway redundancy. So an example
SW1
int vlan 10
ip address 192.168.5.2 255.255.255.0
standby 10 ip 192.168.5.1
standby 10 pri 110
standby 10 preempt
standby 10 auth
SW2
ip address 192.168.5.3 255.255.255.0
standby 10 ip 192.168.5.1
standby 10 pri 100
standby 10 auth
then any client in vlan 10 is given the default-gateway of 192.168.5.1
Jon
01-15-2009 07:21 AM
Your first mentioned that both g0/1 and g0/2 are part of the po1 ether but your attachment shows that g0/1 belongs to po1 and g0/2 belongs to po2.
01-15-2009 06:58 AM
Hi,
what do you get when you do:
sh ether sum
what do you see in the log?
At the very basic, i will have:
po1
switchport trunk encapsulation dot1q
switchport mode trunk
g0/1
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode desirable
g0/2
switchport trunk encapsulation dot1q
switchport mode trunk
channel-group 1 mode desirable
01-15-2009 07:41 AM
Hi Guys,
Thanks for the feedback. It seems that I misconfigured the port channel mode and PO1 and PO2 group for both switches.
By the way is it advisable to do port-channel mode ON on both switches? or should I stick to auto-desirable?
Is there any another way to do redundancy aside from HSRP?
Thanks to you guys!
Cheers!
01-15-2009 07:55 AM
I will use mode on prevents negotiation and might a safe bet.
regards
01-17-2009 05:28 PM
Using 'port-channel mode on' means just what it says; there will be no negotiation. I use it because it is quicker. If you use it, you must always be certain that all ports you intend to physically connect are correctly configured BEFORE connecting them. Otherwise, you could wind up with a looping condition that could do some pretty nasty things on your network.
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